Filter press

ABSTRACT

In a filter press wherein a plurality of recessed filter plates are so arranged that the plates can be assembled and separated, a pair of filter elements are provided to each filter plate, each of said elements comprising a filter cloth covering the front or rear bed of the plate, upper and lower cloth-supporting bars which are secured to the upper and lower edges of the cloth, and first and second pairs of flexible elongated driving media such as belts, chains or the like which are secured to said supporting bars. Below the plate, the pair of filter elements are trained over guiding rollers so as to come close to each other. The filter elements may be driven to travel through said driving media by driving means provided above the plate in such a manner that said upper and lower supporting bars are moved upwardly and downwardly in a seesaw-like manner. Cakes accumulated on the cloths may be discharged on the way of downward travels of the cloths very easily.

United States Patent 91 Iwatani Apr. 30, 1974 FILTER PRESS Prima ExaminerRo Lake 75 lve to: Akit h I t ,K -P r, Y 1 n n r z I wa am agawa re Assistant Examiner-DeWalden W. Jones [73] Assignee: Ishigaki Kiko Co., Ltd., Tokyo, [57] ABSTRACT Japan In a filter press wherein a plurality of recessed filter 22] d; F b 23, 1973 plates are so arranged that the plates can be assempp NO: 335,063 bled and separated, a pair of filter elements are provided to each filter plate, each of said elements comprising a filter cloth covering the front or rear bed of [30] Foreign Appli atio Pri rit D t the plate, upper and lower cloth-supporting bars Mar. 6 1972 Japan 47-23481 which are Secured to the upper and lower edges of the July 3 1972 Japan 47-66800 cloth and first and Second Pairs of flexible elongated driving media such as belts, chains or the like which [52] us. c1. 210/225 210/231 are secured to said supporting bars- Below the Plate 51 Int. Cl 1301a 25/38 the Pair of filter elements are trained Over guiding [58] Field of Search 210/225 230 231 357 as close to each The filter 6 merits may be driven to travel through said driving media by driving means provided above the plate in [56] References Cited such a manner that said upper and lower supporting bars are moved upwardly and downwardly in a see- UNITED T E PATENTS saw-like manner. Cakes accumulated on the cloths l a h may be discharged on the way of downward travels of OH t. 1 3,696,930 10/1972 Tokura 210/225 the Cloths very easfly' 3,767,052 10/1973 Shibasaki 210/225 19 Claims, 26 Drawing Figures U ,1 K, a 41 m PATENTEBAPR 30 m4 saw .01 or 19 PATENTEDAPR so \914 saw us or 19 PATENTEDAPRSO mm SHEET "0? UF 19.

PATENTEDAPR 30 1824 saw .08 or 19 PATENTEflAPRsmsn I sis-07367 snwqnsur 19 PATENTEDAPR 30 m4 3.801.567 sum '10 or 19 PATENTEWISO m $807,567

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1. A filter press including a plurality of recessed filter plates arranged between front and rear machine frames so that the plates can be assembled and separated, each of said filter plates being provided with a pair of filter elements, each filter element comprising a filter cloth covering one of the front and rear cloth-supporting beds of the plate, upper and lower clothsupporting bars secured respectively to the upper and lower edges of said filter cloth, a first pair of flexible elongated driving media which are connected to both ends of said upper supporting bar, and a second pair of flexible elongated driving media which are connected to both ends of said lower supporting bar, one pair of ends of said pair of filter elements being supported respectively through said first pairs of driving media by rotatably supported means which are arranged above the filter plate, and the other pair of ends of said pair of filter elements being trained over a pair of guiding rollers arranged below the filter plate in such a manner that the filter elements are brought close to each other and then are supported respectively through said second pairs of driving media by rotatably supported means which are arranged above the filter plate, driving means for driving said former and latter rotatably supported means in such a manner that the first or second pairs of driving media are pulled down when the second or first pairs of driving media are pulled up, a slurry-feeding device interposed between the filter cloths covering respectively rear and front cloth-supporting beds of each pair of adjacent filter plates, and cake-discharging means below each filter plate for discharging cakes from the surfaces of the cloths on the way of travel of said cloths.
 2. The filter press as claimed in claim 1 wherein the filter cloths of each pair of filter elements are supported by a common lower cloth-supporting bar.
 3. The filter press as claimed in claim 1 wherein the upper edges of the filter cloths which cover respectively thE front cloth-supporting bed of a filter plate and the rear cloth-supporting bed of an adjacent filter plate are supported by a common upper cloth-supporting bar.
 4. The filter press as claimed in claim 1 wherein the filter cloths of each pair of filter elements are supported by a common lower cloth-supporting bar and the upper edges of the filter cloths which cover respectively the front cloth-supporting bed of a filter plate and the rear cloth-supporting bed of an adjacent filter plate are supported by a common upper cloth-supporting bar.
 5. The filter press as claimed in claim 1 wherein means for tensioning the filter cloths are disposed between said upper cloth-supporting bars and said first pairs of elongated driving media or between said lower cloth-supporting bars and said second pairs of elongated driving media.
 6. The filter press as claimed in claim 1 wherein a guiding roll having a diameter larger than the thickness of each filter plate is arranged below each filter plate above said guiding rollers, the roll having a deformable outer layer whereby adjacent guiding rolls do not interfere with each other due to the deformation of the rolls when the filter plates are assembled.
 7. The filter press as claimed in claim 1 wherein said cake-discharging means are composed of scrapers, each scraper being faced to one of said guiding rollers.
 8. The filter press as claimed in claim 7 wherein each of the filter cloths has such a small length that the cloth is located only at the front or rear of each filter plate, and each of said cake-discharging means is provided with displacing means which displaces said discharging means apart from the periphery of each guiding rollers only when each of said lower cloth-supporting bars passes round said roller.
 9. The filter press as claimed in claim 1 wherein washing devices which spray washing water toward the inner surfaces of the filter cloths during the travels of the cloths are arranged below the filter plates.
 10. The filter press as claimed in claim 1 wherein said pair of filter elements are supported by each filter plate by brackets which project from the plate.
 11. The filter press as claimed in claim 1 wherein said filter elements are supported by supporting frames which are disposed between the outside each pair of adjacent filter plates and are slidably supported by guiding rails bridged between the front and rear machine frames.
 12. The filter press as claimed in claim 1 wherein said first and second pairs of elongated driving media are made into common ones which are trained over said rotatably supported means above each filter plate.
 13. The filter press as claimed in claim 12 wherein said elongated driving media comprise chains and said rotatably supported means comprise sprocket wheels over which said chains are trained.
 14. The filter press as claimed in claim 1 wherein said elongated driving media comprise belts and said rotatably supported means comprise drums which wind up and off said belts.
 15. The filter press as claimed in claim 14 wherein said drums above each filter plate are mounted on a driven shaft arranged above said plate, the belts connected to the upper supporting bars being wound around the drums in one direction and the belts connected to the lower supporting bars being wound around the drums in the other direction.
 16. The filter press as claimed in claim 1 wherein each of said slurry-feeding devices is secured to the upper portions of the filter cloths covering respectively a front cloth-supporting bed of a filter plate and a rear cloth-supporting bed of an adjacent filter plate, the device having a slurry passage and a feed passage running from said slurry passage downwardly and opening between said cloths, said slurry passage being communicated to slurry passages provided to the filter plates and filter cloths when the filter plates are assembled.
 17. The filter press as claimed in claim 16 wherein each of said slurry-feeding devices is composed of a pair Of plate members which are pivotally connected to each other at the top and which are secured respectively to the filter cloths.
 18. The filter press as claimed in claim 1 wherein said slurry-feeding devices are slidably supported by guiding rods which are bridged between the front and rear machine frames and the devices are communicated to a slurry source through flexible pipes.
 19. The filter press as claimed in claim 1 wherein each of said cloth-supporting beds of the filter plates is formed with a diaphragm of a flexible material in such a manner that a closed compartment is formed behind said diaphragm, said compartment being communicated to a source of compressed fluid. 